Centrifugal or similar pump.



PATENTBD OCT. 18, 1904.

P. RAY. GENTRIFUGAL UR SIMILAR PUMP. APPLICATION mum 00121, 1903.

no MODEL.

l nvenfor': e?" M r ML. & a g m;

"UNITED STATES Patented October 18, 1904.

FREDERICK RAY, or EAST ORANGE,

R. WORTHINGTON, or NEW YORK,

JERSEY.

NEW JERSEY, ASSIGNOR TO HENRY N. Y., A CORPORATION OF NEW OENTRlFUG-AL0R simiLAR PUl IIP. V

SPECIFICATION forming part of Letters Patent No. 772,532, dated October18, 1904. Application filed Gctolier 1, 1903. Serial No, 175,288. (Nomodel.)

This invention relates particularly to that class of centrifugal orsimilar pumps in which the suction is on one side of the rotaryimpeller, the especial obiect of the invention being to provideelficient and convenient means for balancing the impeller and avoidingleakage.

suction fluid admitted to the back of the impeller, in combination withexterior vanes on the impeller,by which the pressure toward the centeris reduced and the leakage which would otherwise occur in connectionwith the balancing construction is avoided.

llhe invention will now be described in connection with the accompanyingdrawings,

showing the invention applied in its preferred form to a common typeofcentrifugal pump, and the features forming the invention will then bespecifically pointed out in the claims. In the drawings, Figure 1 is acentral section of the pump, taken longitudinally of the axis. Fig. 2 isa central section through the impeller transversely to the axis.

Referring to the drawings, A is the pumpcasing, B the impeller shown ashaving the usual curved vanes C, and D is the suctionpassage at the hubof the impeller on one side. On the opposite or rear side of theimpeller the hub is provided with holes 10, through which the suctionfluid may pass to the rear side of the impeller, and the impeller andeasing are provided, respectively, with rings 12 13, forming a runningjoint on the rear of the impeller outside the openings 10. At each sideof the impeller B are cham- The invention consists in a balancing con-rstruction at the hub of the impeller with the bers 14, preferably closedto the impeller chamber, in which chambers run vanes 15, carried by theimpeller B, which are shown as extending from the end of the impeller tothe ring 12 on one side of the impeller and to the suction-nozzle of theimpeller on the opposite side. The length of these vanes may be varied,however. The impeller B is shown ascarried by the shaft E and mounted inthe usual manner. The fluid passing through the holes 10 to the rear ofthe impeller produces a pressure on the rear surface of the impellerhubwithin the running joint formed by the rings 12 13, which pressuresubstantially counterbalances the pressure on the front side of theimpeller opposite, the suction-passage D. The pressure withintheimpeller outside the suction-passage is balanced by'the equal inwardpressure against the opposite side walls of the impeller, so that withthe balancing of the pressure opposite the suction-passage theimpelleris fully balanced. it is found in practice that the combination of thevanes 15 with the balancing construction at the hub secures a veryeflicient balance of the impeller for diflerent running conditionswithout special construction of the vanes 15- for differentrunningconditions, while at the same time the reduction of the pressuretoward the center by the vanes 15 avoids the leakage at the jointbetween the rings 12 13, which otherwise would occur.

The balancing-ring construction may be used in connection with vanes 15on only the rear or balancing side of the impeller, and such aconstruction is included in the invention, considered broadly; but theconstruction shown is preferred and is specifically claimed. it will beunderstood, also, that the invention is not limited to the particulartype of pump shown nor to the specific form of the balancing devices,but that modifications may be made in the construction illustrated whileretaining the invention defined by the claims. it will be understood,also, that the invention is applicable to multistage pumpsthat is, pumpshaving a series of impellers-as well as to single-stage pumps, eachimpeller being balanced in the same manner.

What is claimed is 1. In a centrifugal or similar pump, the combinationwith the rotary impeller having its suction at the hub on one side, ofopenings at the impeller-hub for admitting fluid to the back of theimpeller, a running joint on the back of the impeller outside saidopenings, a chamber on the back of the impeller outside said joint, andvanes carried by the impeller running in said chamber.

2. In a centrifugal or similar pump, the combination with the rotaryimpeller having its suction at the hub on one side, ofopenings at theimpeller-hub for admitting fluid to the back of the impeller, a runningjoint on the back of the impeller outside said openings, a

chamber on the back of the impeller outside said joint, a chamber on theopposite side of the impeller, and vanes carried by the impeller runningin said chambers.

3. The combination with the inclosed impeller B, having suction-openingD at the hub on one side, of rings 12, 13 on the back of the impellerand the casing forming a running joint, openings 10 through the back ofthe impeller within said joint, chamber 14 on the rear side of theimpeller, and vanes 15 carried by the impeller in said chamber.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

FREDERICK RAY. Witnesses:

C. J. SAWYER, W. H. KENNEDY.

